Granted Patent
Utility
US 4,417,573 · App. 06/279,957
Patient adaptor for medical ventilator
Inventor:
Douglas F. De Vries
Patented Case
View Patent ↗
Granted: Nov 29, 1983
Filed: Jul 2, 1981
Inventor
Douglas F. De Vries
Assignee (at issue)
Bear Medical Systems, Inc.
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.